#!/usr/bin/env python3
import minimalmodbus
import serial

instrument = minimalmodbus.Instrument('/dev/ttyUSB0', 11)  # port name, slave address (in decimal)

ledstatus = input("Give in 0 or 1 to turn on or off the led: ")
instrument.write_register(1, int(ledstatus), 0)  # Registernumber, value, number of decimals for storage

readledstatus = instrument.read_register(1, 0)  # Registernumber, number of decimals
print(readledstatus)